Is the Prefix
Prefix: '&7[&4CostumActionbar&7] '
Message for no Permissions
NoPermissions: '&4You dont have permissions to do that.'
Permission you need to make an Actionbar
Permission: 'costum.bar'
Message when somebody types it wrong
Message1: 'Please use /setactionbar <Message>'
Message when someone used the command
Message2: '&7You have set the Action bar to ' after this here comes the Actionbar text you set.
Like this: